Practice Test GeeksCOHN Exam Practice Test
← All COHN Flashcard Decks

Toxicology and Biohazards Flashcards

7 cards from real COHN practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 7 Toxicology and Biohazards flashcards as text

  1. A battery manufacturing worker with elevated blood lead level (BLL) of 50 µg/dL is asymptomatic. According to OSHA's Lead Standard, the occupational health nurse should:

    Answer: Remove the worker from lead exposure until BLL falls below 40 µg/dL

    OSHA's Lead Standard (29 CFR 1910.1025) requires medical removal when BLL reaches 50 µg/dL, with return to work prohibited until BLL falls below 40 µg/dL on two successive tests.

  2. Which class of fire extinguisher is appropriate for a fire involving energized electrical equipment?

    Answer: Class C

    Class C extinguishers use non-conductive extinguishing agents (CO₂ or dry chemical) safe for energized electrical equipment, where water-based Class A agents would create electrocution risk.

  3. A semiconductor fabrication worker is exposed to arsine (AsH₃) gas. The MOST critical early target organ affected by acute arsine toxicity is the:

    Answer: Red blood cells, causing massive hemolysis

    Arsine causes rapid, massive hemolysis of red blood cells, leading to hemoglobinuria, acute renal failure (secondary), and potentially fatal anemia — hemolysis is the primary acute mechanism.

  4. Which OSHA standard requires employers to label containers of hazardous chemicals and train workers on chemical hazards using a standardized 16-section format?

    Answer: Hazard Communication Standard (29 CFR 1910.1200)

    OSHA's Hazard Communication Standard (HazCom/GHS) requires Safety Data Sheets in 16-section GHS format, GHS-compliant labeling, and worker training on chemical hazards.

  5. A paint shop worker develops contact dermatitis after starting to use a new solvent. The MOST important initial nursing intervention is:

    Answer: Identify the causative agent through patch testing and remove exposure

    Identifying the specific causative agent through patch testing is essential for accurate diagnosis and targeted exposure elimination; symptomatic treatment alone allows continued sensitization.

  6. Benzene is classified as a human carcinogen primarily associated with which cancer?

    Answer: Leukemia (particularly AML)

    Benzene is a Group 1 IARC carcinogen strongly linked to acute myelogenous leukemia (AML) and other hematological malignancies through bone marrow toxicity.

  7. The health effect associated with chronic inhalation of crystalline silica is:

    Answer: Silicosis

    Crystalline silica inhalation causes silicosis, characterized by progressive fibrotic nodules in lung parenchyma, and also increases risk of lung cancer and tuberculosis.